Coexistence of a locally undifferentiated foraging guild: Avian snatchers in a southeastern Australian forest

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    Abstract

    Three species of sexually dichromatic, insectivorous birds (Golden Whistler, Pachycephala pectoralis; Rufous Whistler, Pa. rufiventris; Rose Robin, Petroica rosea) employ a characteristic foraging manoeuvre (snatching or sally-striking) disproportionately often, leading several studies to group them together in one foraging guild. The three species synchronously co-occupy an extensive eucalypt forest east of Melbourne, Australia (Olinda State Forest). All assemble in relatively high densities in late winter and through spring and early summer to breed. Log-linear modelling of use of foraging techniques, substrate, plant species and heights within the forest indicate that all six species–gender groups virtually do not differ from one another: a situation in which very similar species coexist at high densities. The results are considered in the context of interspecific competition among ecologically similar species and it is suggested how such a situation might arise and be sustained. The absence of gender-specific differentiation within species is also addressed.
    Original languageEnglish
    Pages (from-to)69-82
    Number of pages14
    JournalAustral Ecology
    Volume25
    Issue number1
    DOIs
    Publication statusPublished - 2000

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    guild
    coexistence
    foraging
    state forests
    interspecific competition
    Rosa
    breeds
    winter
    gender
    birds
    summer
    bird
    substrate
    modeling
    methodology

    Cite this

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    abstract = "Three species of sexually dichromatic, insectivorous birds (Golden Whistler, Pachycephala pectoralis; Rufous Whistler, Pa. rufiventris; Rose Robin, Petroica rosea) employ a characteristic foraging manoeuvre (snatching or sally-striking) disproportionately often, leading several studies to group them together in one foraging guild. The three species synchronously co-occupy an extensive eucalypt forest east of Melbourne, Australia (Olinda State Forest). All assemble in relatively high densities in late winter and through spring and early summer to breed. Log-linear modelling of use of foraging techniques, substrate, plant species and heights within the forest indicate that all six species–gender groups virtually do not differ from one another: a situation in which very similar species coexist at high densities. The results are considered in the context of interspecific competition among ecologically similar species and it is suggested how such a situation might arise and be sustained. The absence of gender-specific differentiation within species is also addressed.",
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    Coexistence of a locally undifferentiated foraging guild: Avian snatchers in a southeastern Australian forest. / Mac Nally, R.

    In: Austral Ecology, Vol. 25, No. 1, 2000, p. 69-82.

    Research output: Contribution to journalArticle

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